Ayerton Grenavan Friends

Grandis Granva is the head of the Grandis Gang, a trio of jewel thieves. Once a wealthy Italian noblewoman, she lost her fortune to a deceitful womanizer. She met Nadia while in pursuit of her jeweled necklace, the Blue Water. Later, they became friends.

Hanson is Grandis' henchman/friend and happens to be the brains of the Grandis Gang.

The second main protagonist of Nadia - Secret of Blue Water, Jean is a 14 year-old orphan from France who fell in love with Nadia at first sight.

Marie is a 4 year child orphaned by the hands of Gargoyle and the Neo-Atlanteans, who killed her parents. She is soon found by Nadia and Jean, who decide to keep her and to take good care of her.

Sanson is Grandis henchman/friend and happens to be the strong man, sharp-shooter, and driver of the Grandis Gang.